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1、MeasurementSystemAnalysis(MSA)AMeasurementSystemisthecombinationofgauges,hardware,software,procedures,personnel,andtraininginvolvedinobtainingmeasurements.量測系統包含量規,硬件,軟件,制程,員工,通用量測方面的復雜訓練等。MeasurementSystemAnalysis(MSA)AGaugeisanydeviceusedtoobtainmeasurements.AGaugeR&Rtypicallyrefe
2、rstoafairlysimpleprocedureusedtoquantifythe“gaugeerror”andthe“operatorerror”.量具是任何一種用來獲得量測的設備。量具重復性與再現性分析典型的AMeasurementSystemAnalysisinvolvesquantifyingandunderstandingallofthecharacteristicsofthemeasurementsystem.量測系統分析牽連到量化和認知量測系統所有的特性。AGaugeR&RisasubsetofaMeasurementSystemAnalys
3、is!MeasurementSystemCharacteristics量測系統特性Bias(Accuracy)偏性(準確性)GaugeRepeatability量具重復性OperatorReproducibility操作再現性Stability穩定性Linearity線性Bias偏性Thedifferencebetweentheaverageoftheobservedmeasurementsandastandardorreferencevalue.Alsocalledthemeasurementaccuracy.量測觀察平均值與標準值OR參考值之間的差異,稱為
4、偏性。StandardValueAverageObservedValueBIAS觀測平均值標準值Bias偏性BiasisalsoreferredtoasAccuracy.++++++++++++++++++Target靶子Target靶子Biased偏差Un-biased無偏差Example:AgaugeblockusedasastandardwasmeasuredbyNIST(NationalInstituteofStandards)tobe1inch.Youmeasurewithacaliperandfindittobe1.05inches.Thebias
5、is.05inches.例如:一個可追溯到國家標準的量塊測量到的是1英寸。你用卡尺測量時發現它是1.05英尺,這樣偏性就是0.05英寸,DetermineBiasusing決定偏性運用獨立樣品法AnIndependentSampleMethod1.Selectaproductionpartthatfallsnearthemid-rangeofproductionmeasurements.選一個生產量測落在中間帶的生產部品它可能有幾個表現低,中,高機差值的部分是令人滿意的。Itmaybedesirabletohaveseveralpartsthatreprese
6、ntlow,mid,andhigh-rangevalues.用實驗室等級高精確度的量具將每個部分量測10次,每部分的平均值將作為它的參考值。Measureeachoftheparts10timesusingahigh-precision,laboratorygradegauge.TheaverageforeachpartwillbeitsReferenceValue.讓一`個操作者將每個部分用生產量具量測10次,這個平均值將作為部品平均值。3.Haveoneoperatormeasureeachpart10timesusingtheproductiongaug
7、e.TheaverageforeachpartwillbeitsPartAverage.部品平均值減去部品參考值即是他的部品偏性。SubtracteachPartAveragefromitsReferenceValue.ThisisthepartBias.Bias=ObservedAverageMeasurement–ReferenceValue量測觀察平均值—參考值ProcessVariation=6sigmarange(6sP)制程變異=6sP即規格上限—規格下限=制程變異=6sPPercentBias=BiasProcessVariationCalcul
8、atingBias偏性計算Causes
